Beneficiating lubricants, etc.



, Michlers Patented Jan. 16, 1945 2,367 ,264 BENEFICIATIN G LUBRICANTS,ETC.

Robert E. Burk and Everett C. Hughes, Cleveland Heights, Ohio, assignorsto The Standard Oil Company, Cleveland, Ohio, a corporation of Ohio NoDrawing. Application September 30, 1940, Serial N0. 359,095

2 Claims.

Various agents have been proposed for incorporation in lubricating oilsand the like for restraining deterioration, some having more or lessutility in such direction. We have now found that a peculiar group oforganic compounds of quite complex. character is of outstanding actionand utility in petroleum products particularly of low volatilecharacter.

To the accomplishment of the foregoing and related ends, the invention,then, comprises the features hereinafter fully described, andparticularly pointed out in the claims, the following descriptionsetting forth in detail certain illustrative embodiments of theinvention, these being indicative however, of but a few of the variousways in which the principle of the invention may be employed.

A lubricating-stock for instance, which it is desired to protect againstdeterioration, as in drastic usage in 'an internal combustion engine,is, in accordance with the present invention, provided with a, smallamount of a substituted phenylmethane compound, among which the phenylgroup may have substituents, or the methane carbon atom may be replacedby substituents, or substituents may occur in both. Compounds aredesirable which are of the general formula in which R is hydrogen,hydrocarbon radical or substituted derivatives of such group, or acylresidue, X is carbon, nitrogen, sulphur, S-S, oxy s n, phosphorus,aluminum, boron, arsenic, antimony, OP-O, or OAl-O, and optionally withone or two side groups which 'may be hydrogen, hydrocarbon radical orderivative or substitution product, oxygen-, su1phur-, ornitrogen-derivatives, or halogen except as side group from sulphur ornitrogen. Illustrative of such compounds are Michlers hydrol ortetramethyldiaminobenzhydrol, Michlers thiohydrol, Michlers ketone,

thioketone, tetramethyldiaminodiphenyl mono or 'dichloromethane,4,4'-dimethylaminobenzophenonimide, aluminum tri-Michlers hydrolate,Michlers hydrolxanthate, tetramethyldiaminodiphenylamine,tetramethyldiaminodiphenyldisulphide,tetramethyldiaminodiphenylphosphine, p-diaminodiphenyldisulphide, etc.These agents are applied in amount of 0.05 to 5.0 per cent, depending.upon the stock and the particular duty in view. In general, less than 2per cent is sufiicient. The agent is readily dissolved and disseminatedin th oil. The lubricating stock may be of source and character asdesired, and for instance 45 to 200 sec. Saybolt Universal at 210 F.

Similarly such agent may be introduced into other petroleum products,such as asphalt, etc., solid products conveniently being molten topermit thorough dissemination of the agent.

As an example: With a 20 S. A. E. lubricating stock of Mid-Continentsource, there is incorporated 0.25 per cent of MichlerTs thiohydrol.This lubricant, when tested by the common quick test, viz. subjection toa temperature of 300 F. in full exposure to air bubbled through at therate of thirty liters per hour, for 65 hours, showed a viscosityincrease of 57, naphtha insolubles 2.6 per cent, lacquer formation 14.0percent, and ap pearance rating B minus. In contrast, the oil withoutthe Michlers thiohydrol, similarly tested, showed a viscosity increaseof 236, naphtha insolubles 7.7, lacquer formation 43.3, and appearancerating D.

As another example: With a similar oil there aminobenzhydrol. Thislubricant, tested as foregoing, showed a viscosity increase of 33,naphtha insoluble 0.3, lacquer formation 4.2, and appearance rating Bminus.

As another example: With a similar oil there is incorporated 0.25 percent of 4,4-dimethylaminobenzophenonimide.

As another example: With a similar oil there is incorporated 0.25 percent of diaminodiphenyldisulphide.

Particularly advantageous are the compounds of the, above generalformula in which X is as stated, except carbon and nitrogen.

Other modes of applying the principle of the invention may be employed,change being'made as regards the details described, provided the fea--tures stated in any of the following claims, or the equivalent of such,be employed.

We therefore particularly point out and distinctly claim as ourinvention:

' 1. A composition consisting of a normally nonvolatile hydrocarbonproduct and a small amount of a substituted aminodiphenylmethanecompound having bonded to its central carbon atom an atom of group VI ofthe periodic system of atomic weight not exceeding that of sulphur.

2. A normally non-volatile hydrocarbon prodnot containing a small amountof Michlers thiohydrol.

ROBERT E. BURK. EVERETT C. HUGHES.

